CRS-500 1:N Redundancy System
Revision 4
Serial Interface Operation
10–5
MN-CRS-500
10.2.5.2
Target Address
While up to 9,999 devices can be uniquely addressed, the CRS-500 imposes some limitations:
•
In EIA-232 applications, this value is set to 0000.
•
In EIA-485 applications, the Switch may be set to an address of 1000, 3000, 5000 or 7000. This allows up to four Switches to be
connected on the same bus.
•
The 11 modems that may be connected to the Switch may be accessed for remote monitor & control through the Switch via
virtual
addresses. See
Appendix C. ADDRESSING SCHEME INFORMATION
for details.
•
Valid remote commands and queries that can be sent to the modems via the Switch depend upon the modem protocol and the
installed options. Consult the appropriate modem
Installation and Operation Manual
for further information.
Note that, regardless of the Switch COMs being set up for either EIA-232 or EIA-485 mode, the Switch communicates with the modems
via Telnet.
The Controller sends a packet with the address of a Target - the destination of the packet. When the Target responds, the address used is
the same address, to indicate to the Controller the source of the packet. The Controller does not have its own address.
The Comtech SatMac application software (Version 3.6 or higher) can monitor and control a CRS-500 1:N Redundancy System. See
Appendix C. ADDRESSING SCHEME INFORMATION
for details.
There also are address restrictions for distant-end modems (being accessed by EDMAC) and Comtech transceivers, connected either
locally or at the distant-end of a link. See
Appendix C. ADDRESSING SCHEME INFORMATION
for details.
10.2.5.3
Address Delimiter
This is the forward slash character:
/
(ASCII code 47)
10.2.5.4
Instruction Code
This three-character alphabetic sequence is intended to be a mnemonic of its operational function. This aids in the readability of the
message, should you display it in its raw ASCII form. For example, “BKH” means “Backup Holdoff; “SID” means “Switch ID”, etc. You may
use only upper case alphabetic characters (A-Z, ASCII codes 65-90).
10.2.5.5
Instruction Code Qualifier
This single character further qualifies the preceding instruction code. Instruction Code Qualifiers obey specific rules.
Summary of Contents for CRS-500
Page 24: ...CRS 500 1 N Redundancy System Revision 4 Preface x MN CRS 500 Notes...
Page 38: ...CRS 500 1 N Redundancy System Revision 4 Introduction 1 14 MN CRS 500 BLANK PAGE...
Page 60: ...CRS 500 1 N Redundancy System Revision 4 Installation 4 6 MN CRS 500 BLANK PAGE...
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Page 220: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...
